if you ever try to sell the house, a building inspector will note the "rigged" wiring and recommend that the wiring be replaced due to it not being up to code and hazardous. it is time to rewire with 2 + ground cable. It would also be a good time to upgrade to a breaker box rated at 150-200 amps. if you install a new breaker box, the wiring can all be run to the service boxes, and then the wiring can be changed over when the power company connects the new breaker box.